(57) A multi-room type heat pump air conditioner comprises an outdoor unit (A) including
a compressor (1), an outdoor four-way valve (2) and an outdoor heat exchanger (3),
a plurality of indoor units (B,C,D), each including an indoor heat exchanger (10)
and a throttle device (12), and the indoor units being connected in parallel by means
of a first and a second connecting pipe (7,8) so as to form a refrigerating cycle.
Each indoor heat exchanger has one end connected to an indoor four-way valve (13)
so as to switch the end from one of the first and the second connecting pipe (7,8)
to the other; each indoor heat exchnger has the other end connected to a third connecting
pipe (9) for connecting between the indoor units, through the throttle device (12).
The third connecting pipe (9) and the indoor four-way valve (13) are connected to
each other through an opening and closing valve (18) in each indoor unit.
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